首页 > whether和if 使用方法分析附习题

whether和if 使用方法分析附习题

发布时间：2010-12-17 11:00:23 来源：文档文库

小中大

字号：

手机查看

1.whether和if均可用来引导主语从句，但if引导的从句不能位于句首。

如： Whether they win or lose is all the same to me. 他们是赢是输於我都一样.（此时whether不能换作if ）

It's doubtful whether there'll be any seats left. 说不上还有没有空座位了. (此句whether能换作if)

2.whether和if均可用来引导宾语从句。

如：①I don't know whether/if I will be able to come.我不知道我是否能来.

②She asked me whether/if I was interested in working for her.她问我是否有兴趣为她工作。

③We'll be told tomorrow whether we should take the exam or not.我们明天才知道是不是应该参加考试.

④I asked him whether he had done all the work himself or whether he had had any assistance. 我问他这些工作都是他自己做的还是别人帮他做的.

( 注意: 在两个供选择的从句之间若用or字, 则须重复whether一字. )

注: ⑴当强调宾语从句并将其提前时只能用whether。

如:Whether I'll have time to go with you I am not sure.我很难说我们是否有时间跟你们一起去。

⑵ 从句作介词宾语时只用whether不用if。

如:She was undecided about whether she should accept his offer.她拿不定主意应该不应该接受他的好意

      ⑶ 当whether和or not连用时，只用whether不用if。当or not放在whether引导的从句句尾，则可以用if来替换。

      如: I don’t know whether or not he will come.我不知道他是不是回来。

I'll be happy whether/if I get the job or not我能不能得到那份工作都一样高兴

      ⑷ 当whether和or 连用表示明确的选择时，只用whether不用if。

       如:He asked me whether I wanted to go there by train or by bus.他问我是想乘火车还是坐公共汽车去那里。

          He hesitated about whether he should drive or take the train.他开车去还是坐火车去, 犹豫不决

注:whether 和or 连用还可以引导让步状语从句,此时也不用if。

如：We'll go on with the work, whether we can find the necessary tools or not.

不管我们能否找到所需的工具,我们要把这件工作做下去。

           Whether or not it rains / Whether it rains or not, we're playing football on Saturday.

            无论下不下雨, 我们星期六一定踢足球.

⑸ 动词discuss，decide,consider等后习惯上也常用Whether引导从句，不用if。

       They discussed whether they should leave at once.他们讨论了是否应该马上离开。

We discussed whether the house should be sold. 我们讨论了这房子是否应卖掉。

3.表语从句用whether引导不用if.

如:①The doubt was whether you had broken the beautiful vase. 疑问是你是否打坏了这只漂亮的花瓶。

4. 同位语从句用whether引导不用if.

如:①The question whether we'll build another lecture building hasn't been settled.

是否要另建一幢教学楼的问题还未决定。

5. 在动词不定式之前，只能用whether，不能用if。

如:①The question is whether to go to Munich or Vienna. 问题是去慕尼黑还是去维也纳.

②She doesn't knows whether to get married now or wait. 是否现在结婚或是等待她不知道。

③We were wondering whether to go today or tomorrow. 我们弄不清是今天走还是明天走.

④I'm not sure whether to resign or stay on. 我拿不准主意是辞职还是留任.

强化练习：

1. The question has not been answered ____ Taiwan will be included on the Olympic torch relay route.

A．that       B．whether       C．which        D．if

2. You have not yet answered my question _____ I can join in the party tonight or not.

   A. whether                B. if                              C. that                         D. which

3．— I d like to invite you to a party this evening.

— Thank you, but _____ I’ll be free I m not sure at the moment.

A. while                  B. if                      C. when        D. whether

4．---What are you anxious about?

    ---___________

A.      If we succeed   B.That we can succeed      C. Do we succeed   D.Whether we can succeed

5. Only when _____ the painting _____ decide ______the painting is worth buying.

A. he sees, he can ,whether    B. does he see, can he,   if

C. he sees, can he ,whether    D. sees he, he can,that

6. _____ English is his favourite subject

    A. I asked him if     B. I asked him that whether C. I asked him that     D. I asked him which

7. _____ they’ll go to the Summer Palace ____ the weather.

    A. If; depends on     B. Whether; depends upon C. Whether; depended on     D. If; depended upon

8.It isn’t quite _____ ______ he will be present at the meeting.

    A. sure; whether     B. sure; if      C. certain; whether     D. certain; that

9. _____ the 2008 Olympic will be held in Beijing is not known yet.

    A. Whether     B. If     C. Whenever     D. That

10. No one was sure _____ he would be asked to speak next year.

    A. when     B. whether     C. what     D. how

11. It is still a question to us all _____ there is any living thing in some other places in the space.

    A. whether     B. which       C. what     D. where

12. I doubt _____ he will come here on time.

A. that B. whether C. when D. where

13. The point is not who said the words, _____ they are true or not.

A. but whether     B. and whether     C. but how     D. and how

14. “What did he ask you?” “_____ I would be late.”

A. That     B. When     C. Where     D. Whether

15. He treated all the people around him,______he knew or he didn't know,______.

     A. if, friendly                 B. whether, friendly

     C. if, in a friendly way      D. whether, in a friendly way

16. At the meeting, we discussed _____ we should employ more workers.

     A. if      B. whether     C. that     D.不填

Answers: BADDC ABCAB ABADD B